1 /* Machine-dependent hooks for the unix child process stratum, for HPUX PA-RISC.
3 Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993
4 Free Software Foundation, Inc.
6 Contributed by the Center for Software Science at the
7 University of Utah (pa-gdb-bugs@cs.utah.edu).
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
29 #include <sys/ptrace.h>
31 extern CORE_ADDR text_end
;
33 static void fetch_register ();
35 /* This function simply calls ptrace with the given arguments.
36 It exists so that all calls to ptrace are isolated in this
37 machine-dependent file. */
39 call_ptrace (request
, pid
, addr
, data
)
41 PTRACE_ARG3_TYPE addr
;
44 return ptrace (request
, pid
, addr
, data
, 0);
50 if (inferior_pid
== 0)
52 ptrace (PT_EXIT
, inferior_pid
, (PTRACE_ARG3_TYPE
) 0, 0, 0);
54 target_mourn_inferior ();
57 /* Start debugging the process whose number is PID. */
63 ptrace (PT_ATTACH
, pid
, (PTRACE_ARG3_TYPE
) 0, 0, 0);
65 perror_with_name ("ptrace");
70 /* Stop debugging the process whose number is PID
71 and continue it with signal number SIGNAL.
72 SIGNAL = 0 means just continue it. */
79 ptrace (PT_DETACH
, inferior_pid
, (PTRACE_ARG3_TYPE
) 1, signal
, 0);
81 perror_with_name ("ptrace");
85 /* Fetch all registers, or just one, from the child process. */
88 fetch_inferior_registers (regno
)
92 for (regno
= 0; regno
< NUM_REGS
; regno
++)
93 fetch_register (regno
);
95 fetch_register (regno
);
98 /* Store our register values back into the inferior.
99 If REGNO is -1, do this for all registers.
100 Otherwise, REGNO specifies which register (so we can save time). */
103 store_inferior_registers (regno
)
106 register unsigned int regaddr
;
108 extern char registers
[];
110 unsigned int offset
= U_REGS_OFFSET
;
115 regaddr
= register_addr (regno
, offset
);
117 if (regno
== PCOQ_HEAD_REGNUM
|| regno
== PCOQ_TAIL_REGNUM
)
119 scratch
= *(int *) ®isters
[REGISTER_BYTE (regno
)] | 0x3;
120 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
124 /* Error, even if attached. Failing to write these two
125 registers is pretty serious. */
126 sprintf (buf
, "writing register number %d", regno
);
127 perror_with_name (buf
);
131 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof(int))
134 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
135 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
], 0);
138 /* Warning, not error, in case we are attached; sometimes the
139 kernel doesn't let us at the registers. */
140 char *err
= safe_strerror (errno
);
141 char *msg
= alloca (strlen (err
) + 128);
142 sprintf (msg
, "writing register %s: %s",
143 reg_names
[regno
], err
);
147 regaddr
+= sizeof(int);
152 for (regno
= 0; regno
< NUM_REGS
; regno
++)
154 if (CANNOT_STORE_REGISTER (regno
))
156 store_inferior_registers (regno
);
163 /* Fetch one register. */
166 fetch_register (regno
)
169 register unsigned int regaddr
;
170 char buf
[MAX_REGISTER_RAW_SIZE
];
171 char mess
[128]; /* For messages */
174 /* Offset of registers within the u area. */
177 offset
= U_REGS_OFFSET
;
179 regaddr
= register_addr (regno
, offset
);
180 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
183 *(int *) &buf
[i
] = ptrace (PT_RUREGS
, inferior_pid
,
184 (PTRACE_ARG3_TYPE
) regaddr
, 0, 0);
185 regaddr
+= sizeof (int);
188 /* Warning, not error, in case we are attached; sometimes the
189 kernel doesn't let us at the registers. */
190 char *err
= safe_strerror (errno
);
191 char *msg
= alloca (strlen (err
) + 128);
192 sprintf (msg
, "reading register %s: %s", reg_names
[regno
], err
);
197 if (regno
== PCOQ_HEAD_REGNUM
|| regno
== PCOQ_TAIL_REGNUM
)
199 supply_register (regno
, buf
);
203 /* Resume execution of process PID.
204 If STEP is nonzero, single-step it.
205 If SIGNAL is nonzero, give it that signal. */
208 child_resume (pid
, step
, signal
)
215 /* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where
216 it was. (If GDB wanted it to start some other way, we have already
217 written a new PC value to the child.) */
220 ptrace (PT_SINGLE
, inferior_pid
, (PTRACE_ARG3_TYPE
) 1, signal
, 0);
222 ptrace (PT_CONTIN
, inferior_pid
, (PTRACE_ARG3_TYPE
) 1, signal
, 0);
225 perror_with_name ("ptrace");
228 /* Copy LEN bytes to or from inferior's memory starting at MEMADDR
229 to debugger memory starting at MYADDR. Copy to inferior if
232 Returns the length copied, which is either the LEN argument or zero.
233 This xfer function does not do partial moves, since child_ops
234 doesn't allow memory operations to cross below us in the target stack
238 child_xfer_memory (memaddr
, myaddr
, len
, write
, target
)
243 struct target_ops
*target
; /* ignored */
246 /* Round starting address down to longword boundary. */
247 register CORE_ADDR addr
= memaddr
& - sizeof (int);
248 /* Round ending address up; get number of longwords that makes. */
250 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
251 /* Allocate buffer of that many longwords. */
252 register int *buffer
= (int *) alloca (count
* sizeof (int));
256 /* Fill start and end extra bytes of buffer with existing memory data. */
258 if (addr
!= memaddr
|| len
< (int)sizeof (int)) {
259 /* Need part of initial word -- fetch it. */
260 buffer
[0] = ptrace (addr
< text_end
? PT_RIUSER
: PT_RDUSER
,
261 inferior_pid
, (PTRACE_ARG3_TYPE
) addr
, 0, 0);
264 if (count
> 1) /* FIXME, avoid if even boundary */
267 = ptrace (addr
< text_end
? PT_RIUSER
: PT_RDUSER
, inferior_pid
,
268 (PTRACE_ARG3_TYPE
) (addr
+ (count
- 1) * sizeof (int)),
272 /* Copy data to be written over corresponding part of buffer */
274 bcopy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
276 /* Write the entire buffer. */
278 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
280 /* The HP-UX kernel crashes if you use PT_WDUSER to write into the text
281 segment. FIXME -- does it work to write into the data segment using
282 WIUSER, or do these idiots really expect us to figure out which segment
283 the address is in, so we can use a separate system call for it??! */
285 ptrace (addr
< text_end
? PT_WIUSER
: PT_WDUSER
, inferior_pid
,
286 (PTRACE_ARG3_TYPE
) addr
,
294 /* Read all the longwords */
295 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
298 buffer
[i
] = ptrace (addr
< text_end
? PT_RIUSER
: PT_RDUSER
,
299 inferior_pid
, (PTRACE_ARG3_TYPE
) addr
, 0, 0);
305 /* Copy appropriate bytes out of the buffer. */
306 bcopy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);